Year	% gross
1970	12.8067502975464
1980	29.0986995697021
1982	30.4552593231201
1983	32.1569786071777
1984	31.5403003692627
1991	27.7964706420898
2006	50.9038696289062
2007	52.3154487609863
2008	52.045238494873
2010	59.1240997314453
2011	59.0529098510742
2012	57.7827911376953